FSCK(8) NetBSD System Manager's Manual FSCK(8)
NAMEfsck -- file system consistency check and interactive repair
SYNOPSISfsck [-dfnPpqvy] [-lmaxparallel] [-Tfstype:fsoptions] [-tfstype]
[-xmountpoint] [special | node ...]
DESCRIPTION
The fsck command invokes file system-specific programs to check the spe-
cial devices listed in the fstab(5) file or in the command line for con-
sistency.
It is normally used in the script /etc/rc during automatic reboot. If no
file systems are specified, and ``preen'' mode is enabled ( -p option)
fsck reads the table /etc/fstab to determine which file systems to check,
in what order. Only partitions in fstab that are mounted ``rw,'' ``rq''
or ``ro'' and that have non-zero pass number are checked. File systems
with pass number 1 (normally just the root file system) are checked one
at a time. When pass 1 completes, all remaining file systems are
checked, running one process per disk drive. By default, file systems
which are already mounted read-write are not checked. The disk drive
containing each file system is inferred from the longest prefix of the
device name that ends in a digit; the remaining characters are assumed to
be the partition designator.
The options are as follows:
-d Debugging mode. Just print the commands without executing them.
-f Force checking of file systems, even when they are marked clean
(for file systems that support this), or when they are mounted
read-write.
-lmaxparallel
Limit the number of parallel checks to the number specified in
the following argument. By default, the limit is the number of
disks, running one process per disk. If a smaller limit is
given, the disks are checked round-robin, one file system at a
time.
-n Causes fsck to assume no as the answer to all operator questions,
except "CONTINUE?".
-P Display a progress meter for each file system check. This option
also disables parallel checking. Note that progress meters are
not supported by all file system types.
-p Enter preen mode. In preen mode, fsck will check all file sys-
tems listed in /etc/fstab according to their pass number, and
will make minor repairs without human intervention.
-q Quiet mode, do not output any messages for clean file systems.
-Tfstype:fsoptions
List of comma separated file system specific options for the
specified file system type, in the same format as mount(8).
-tfstype
Invoke fsck only for the comma separated list of file system
types. If the list starts with ``no'' then invoke fsck for the
file system types that are not specified in the list.
-v Print the commands before executing them.
-xmountpoint
Exclude the file system which has a mountpoint the same as in
/etc/fstab. Used only in ``preen'' mode.
-y Causes fsck to assume yes as the answer to all operator ques-
tions.
FILES
/etc/fstab file system table
EXIT STATUSfsck exits with 0 on success. Any major problems will cause fsck to exit
with the following non-zero exit(3) codes, so as to alert any invoking
program or script that human intervention is required.
1 Usage problem.
2 Unresolved errors while checking the file system. Re-running fsck
on the file system(s) is required.
4 The root file system was changed in the process of checking, and
updating the mount was unsuccessful. A reboot (without sync) is
required.
8 The file system check has failed, and a subsequent check is
required that will require human intervention.
12 fsck exited because of the result of a signal (usually SIGINT or
SIGQUIT from the terminal).
SEE ALSOfstab(5), fsck_ext2fs(8), fsck_ffs(8), fsck_lfs(8), fsck_msdos(8),
mount(8)HISTORY
A fsck utility appeared in 4.0BSD. It was reimplemented as a file system
independent wrapper in NetBSD 1.3. The original file system specific
utility became fsck_ffs(8) at this point.
NetBSD 7.0 September 11, 2016 NetBSD 7.0

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